patch 8.2.3967: error messages are spread out

Problem:    Error messages are spread out.
Solution:   Move more errors to errors.h.
diff --git a/src/spellsuggest.c b/src/spellsuggest.c
index f21d55f..e9f2cd5 100644
--- a/src/spellsuggest.c
+++ b/src/spellsuggest.c
@@ -481,7 +481,7 @@
 
     if (*curwin->w_s->b_p_spl == NUL)
     {
-	emsg(_(e_no_spell));
+	emsg(_(e_spell_checking_is_not_possible));
 	return;
     }
 
@@ -935,7 +935,7 @@
     fd = mch_fopen((char *)fname, "r");
     if (fd == NULL)
     {
-	semsg(_(e_notopen), fname);
+	semsg(_(e_cant_open_file_str), fname);
 	return;
     }